Yarn control means



July 19, 1938. l F, KLElN ET AL 2,124,422

YARN CONTROL MEANS Filed June l0. 1935' ,iL-. INVENTORS' ATTORNEY.

Patented July 19, 193s" PATENT OFFICE YARN CONTROL MEANS Frederick mein, Glen Rock, and Henry Uhlig,

Clifton, N. J., assignors to Sipp-Eastwood Corporation, Paterson, N. J., a corporation of New Jersey Application June 10, 1935, Serial No. 25,768

lClaim.

This invention relates to yarn tension devices and particularly to yarn tension devices of the kind set forth in the Klein Patent No. 1,942,511 in which a suitably braked pulley constitutes the principal tension factor when, by suitable means anterior to the pulley, the yarn is preserved in merely snubbing relation to the pulley. One object is to provide for the absorption of vibrations which, due to the pulley failing closely to fit its axial support, are known to detract from uniformity in the tension on the yarn. Another object is to construct the device so that with respect to the snubbing means a self-cleaning action may proceed when the device is in operation. Still another object is so to construct the device that it may be adapted to raw silk yarn or other yarn carrying gum or other matter likely to interfere with eiicient operation of the device as well as other types of yarns.

In the drawing,

Fig. 1 is a side elevation of the device and a portion of its supporting bracket;

Fig. 2 is a right-hand end elevation thereof;

Figs. 3 and 4 are top and underneath plans thereof, respectively;

Figs. 5 and 6 are sections on lines 5-5 and '6-6, respectively, Fig. 3;

Figs. 7 and 8 are enlarged fragmentary sections of the disks 20 and 2l taken in the plane of travel of the yarn, the views respectively showing the positions of the upper disk with the yarn present and travelling and with the yarn absent.

Though having other uses the device is especially useful to tension a. thread or yarn of a warp being drawn from a creel, as in Patent No. 1,885,114, upstanding from the frame of which may be an arm or bracket I whose upper end is formed dove-tailed in section to fit a certain dove-tailed socket of the support or xed part of the device, which may be a casting.

Such support includes a loop 2 lying in a horizontal plane and a projection 3 extending horizontally from the loop and having one side thereof approximately tangential to the loop and its opposite side approximately parallel with the rst side but extending in a chord of the loop so as to afford vertical clearance for the portion of the yarn which departs from the device, as will appear. The projection has a top forward slope 3a formed with a circular cavity 4 having a central fixed upstanding stud 5 perpendicular to the slope. Fixed parts of the support are a depending arm 6 which is offset from the center of the loop and lies in a diameter thereof extending transversely of the support and a yarn guide I which upstands from the projection 3 and has its bore approximately parallel with the slope. The slope 3a is pitched, as will appear from the drawing, transversely of the yarn in its 5 travel from guide 1 to the pulley. Fixed to the under side of the support in traversing relation to the loop, as -by screws 8, are a metal plate 9 and an insulating plate I0 (between plate 9 and the support), these being so notched and arl0 ranged (Fig. 4) that'the pulley-carrying spindle l2 will on the one hand engage the metal plate and on the other hand the insulating plate when it is shifted one way or the other. Projection 3 has the mentioned socket, 3x, to receive the upper l5 end of bracket I.. So much for the xed structure of the device.

The arm 6 has a horizontal bearing II for the bent-off end or trunnion of the mentioned spindle, I2, upstanding from the bearing, the bend 20 in the spindle being such that the spindle stands canted somewhat as viewed in end elevation of the device (Fig. 2), whereby to reduce the tendency of the trunnion to bind in the bearing under the weight of the spindle and its load. 25 The spindle has fixed thereon a disk I3 above which is the pulley, now to be described.

In the form shown in Figs. 1 to 5 the pulley comprises a central bearing I4, which may be of some suitable light oilless-bearing non-resilient 30, material, as Arguto, and a body portion l5 of resilient and flexible material, as rubber. The bearing and body portion have a circumferential tongue-and-groove connection I6 with each other, the body portion being suiciently iiexible 35 and elastic to permit it to be stretched over the bearing portion to effect engagement of the tongue and groove, it then constrictively embracingthe bearing.

The pulley has an upper iiange of smaller 4() diameter than the lower iiange, the two flanges being formed with theiradjoining faces conical and converging toward each other, preferably nearly bui'l not quite to form an actual apex. 'Ihe bearing of the pulley is formed with a cen- 45 trai hole which receives the spindle. To the underside of the pulley is glued a friction ring I1, which maybe of felt, the same being adapted to engage the disk I3.

Over the stud 5 is tted, free to revolve, a 50 tubular porcelain yarn-guide or post I8 and over this, resting on the bottom of the cavity l, is ntted a felt ring I9. Penetrated by the post and resting on the. ring I9 is a pair of thin metal disks 20 and 2 I the upper one having a weighting 55 disk existing in two layers 22 and 22a soldered together and todisk- 20 and such disk 20 being formed with 'a central tubular stud 20a which is received in the central hole of disk 22 and has its upper or free end peened over upon the latter. As shown in Figs. 7 and 8 each disk is formed circumferentially corrugated, their corrugations being such that when they are coaxial and superposed they mesh with each other. 'Ihe diefor forming each disk willpreferably have concentric sharp-edged corrugations, wherefore at the side of the disk directly opposed to the die the corrugations formed will in a diametric section present sharp-re-entrant angles 23 but at the opposite side they appear with rounded crests 24. In short, the construction is such that with the disks superposed as in Fig. 8 and no thread intervening their opposed faces would contact everywhere except where each rounded crest coincides with an angle, whereby when the yarn intervenes and in the absence of foreign matter (as will appear) the disks obtain a good frictional grip on the yarn, undue abrasive and other harmful action on the thread being avoided by the rounding oi the crests.

Plate 9 has an extensiona to which to connect a wire of an electric circuit completed by the frame of the creel, the support and spindle of the tension device when the spindle 4is allowed to contact with said plate, said circuit containing any signal or other electro-actuated medium as in said Patent No. 1,942,511; as will appear, the spindle is normally held byA the yarn in the position of Fig. 4, abutting the plate I0, so that the circuit is open.

The yarn a extends from the source of supply, as a spool or cone on the creel, between the disks 2li-2|, in contact with the guide I8, then around the pulley for a half turn and thence to the reel of the warping machine or other draft medium.

These observations are necessaryto an accurate appreciation of the importance of our invention:

In the practical use of tension devices of the class of that of the said Klein Patent No, 1,942,511 it is found that disposition of the pulley tochatter or to vibrate in any direction transversely of its axis quite materially detracts from uniformity of tension, which of course not only deleteriously affects the particular yarn controlled by a given tension device but the entire warp where such is being formed by drawing a number (usually hundreds) of yarns from a creel simultaneously. The only recourse heretofore was to bore each pulley bearing hole with such accuracy that whereas the pulley would freely turn there would be practically no possibility of transverse displacement, but even then wear of the bearing hole or of the spindle intime resulted in such vibration.

According to this invention a resilient cushion exists between the pulley bearing, as I4 or Ha, and the perimeter of the pulley. If this cushion exists as at I in Fig. 5, or so that substantially ity of tension results; at least, a careful t of the" bearing hole to the spindle is not necessary and a relatively considerable amount of wear of the -dicu'lar relation to the pulleys axis. Further, if

the actual perimeter of the pulley is formed of resilient material, as in Fig. 5, the frictional grip between the yarn and pulley is enhanced.

Because of the travel of the yarn between the disks 2li-.2| and around guide Il the upper disk.

rotates slowly and the lower disk still more slowly due to the drag on the lower disk produced by the felt ring IS, which further allows the lower disk to yield thus to prevent disruption of the (fastf travelling) yarn should a lump or slub therein suddenly encounter the disks.

I The incline of the disks, especially in view of their propulsion, rotatively, by the yarn, is a factor in removal by gravity of any foreign matter that might intervene between them and so (if such matter is of greater diameter than the yarn) prevent them from setting up that resistance to the travel of the yarn which they should interpose as in the said Klein patent-to wit, sumcient only to cause the yarn to be held in constant snubbing relation to the pulley, which is substantially the sole tension factor. For use with other yarns than raw silk yarn disks presenting flat faces to each other might be used. But in the case of a raw silk yarn or other yarns carrying matter, as gum, likely to collect between the disks we nd it necessary so to corrugate the disks concentrically that their corrugations tend under the weight of the upper disk to intermesh and so more or less shape the yarn a to sinuous form between them, asin Fig. 7. Any particle, as of gum, in that case entering between the disks in practice finds refuge, as at b, in a depression of the series of corrugations, thus still to permit the crests of the corrugations to offer frictional resistance to the yarn and hence to continue the disks in rotation, with the result that if such particle does not become otherwise detached as by movement of the disks, it will be eventually displaced by the yarn, as the disk to which it is attached forces it around against the travelling yarn, and fall away from between the disks.

Having thus fully described our invention what we claim is:

A yarn-tension pulley of the class having a peripheral yarn-engaged surface facing generally outward, said pulley having a central bearing of relatively non-resilient material and also having the circumferential portion thereof affording such surface formed of resilient plastic material, the portion of the pulley between said bearing and first-named portion being a relatively thin web.

FREDERICK KLEIN. HENRY UHLIG. 

